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Issue 22, 2014
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The effect of drop volume and micropillar shape on the apparent contact angle of ordered microstructured surfaces

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Abstract

In the present paper, we propose a new theoretical approach to evaluate the shape and apparent contact angle (ACA) of a drop gently deposited on microstructured superhydrophobic surfaces. We exploit the very large separation of scales between the drop size and the features of the micromorphology of the interface to propose a numerical methodology to calculate the apparent contact area and apparent contact angle. In agreement with very recent experiments, calculations show that, in the case of surfaces made of conical micropillars, the ACA may take values very close to 180° not depending on the size of the liquid drop. At large drop volumes, the shape of the drop deviates from the spherical one as a result of the gravity effects, but it is noteworthy that the apparent contact angle does not change at all. Our calculations shows that this holds true also for different pillar shapes, showing that, for any given Young contact angle of the solid constituting the pillars, the ACA is an intrinsic property of the surface microgeometry.

Graphical abstract: The effect of drop volume and micropillar shape on the apparent contact angle of ordered microstructured surfaces

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Publication details

The article was received on 13 Dec 2013, accepted on 29 Jan 2014 and first published on 29 Jan 2014


Article type: Paper
DOI: 10.1039/C3SM53104J
Citation: Soft Matter, 2014,10, 3906-3914
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    The effect of drop volume and micropillar shape on the apparent contact angle of ordered microstructured surfaces

    L. Afferrante and G. Carbone, Soft Matter, 2014, 10, 3906
    DOI: 10.1039/C3SM53104J

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